Tether



FIG. 1 is a front elevation view of a tether showing my new design;

FIG. 2 is a top plan view of a tether showing my new design;

FIG. 3 is a back plan view of a tether showing my new design;

FIG. 4 is a side plan view of the tether showing my new design;

FIG. 5 is an opposite side plan view of the tether showing my new design; and,

FIG. 6 is a front plan view of the tether showing my new design. 

CLAIM The ornamental design for a tether, as shown and described. 